fix: vuln scan on schedule only requires brnach resolution

Author: jon-nfc

.github/workflows/python.yaml

@@ -1468,8 +1468,12 @@ jobs:
 
 
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1    # v7.0.1
+        if: github.event_name == 'schedule'
         with:
-          ref: ${{ env.BRANCH }}
+          ref: ${{ env.BRANCH }
+
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1    # v7.0.1
+        if: github.event_name != 'schedule'
 
 
       - name: Run Trivy vulnerability scanner against ${{ matrix.requirements }}